Torch neck for thermally joining at least one workpiece, torch with torch neck, and welding device

Abstract

A nozzle stock (3) for a torch neck (10) of a welding device has an internal cavity (7) and at least one gas-outlet opening (8), which is in fluidic connection with the gas outlet (2) of a gas nozzle (1). A nozzle-stock insert (20) in the internal cavity (7) of the nozzle stock (3) has a front end (23) and a rear end (24), wherein the outer wall (22) of the nozzle-stock insert (20) is at a distance from the inner wall (9) of the nozzle stock (3), at least in some regions, to form a flow space (11) that is in fluidic connection with the gas-outlet opening (8) of the nozzle stock (3). A front and/or rear inflow region, which is formed by a front and/or rear gap (25, 26), is provided at the front end (23) and/or at the rear end (24) of the nozzle-stock insert (20).

1 . A torch neck ( 10 ) for a welding device for thermally joining at least one workpiece, comprising:
 a nozzle stock ( 3 ), which has an internal cavity ( 7 ) with an inner wall ( 9 ) and at least one gas-outlet opening ( 8 ), which gas-outlet opening ( 8 ) is in fluidic connection with a gas outlet ( 2 ) of a gas nozzle ( 1 ) for the outflow of a stream of protective gas,   a nozzle-stock insert ( 20 ) , arranged in the internal cavity ( 7 ) of the nozzle stock ( 3 ), said nozzle-stock insert ( 20 ) having a front end ( 23 ) and a rear end ( 24 ) and an outer wall ( 22 ), wherein the outer wall ( 22 ) of the nozzle-stock insert ( 20 ) is at a distance from the inner wall ( 9 ) of the nozzle stock ( 3 ), at least in some regions, to form a flow space ( 11 ) for the stream of protective gas, and the flow space ( 11 ) is in fluidic connection with the gas-outlet opening ( 8 ) of the nozzle stock ( 3 ), and   a front and/or rear inflow region, which is formed by a front and/or rear gap ( 25 ,  26 ) provided at the front end ( 23 ) and/or at the rear end ( 24 ) of the nozzle-stock insert ( 20 ) through which protective gas is introduced into the flow space ( 11 ).   
     
     
         2 . The torch neck ( 10 ) according to  claim 1 , wherein the front end ( 23 ) of the nozzle stock insert ( 20 ) is spaced at a distance to a front dead stop ( 28 ) of the nozzle stock ( 3 ) to form the front inflow region formed by the front gap ( 25 ). 
     
     
         3 . The torch neck ( 10 ) according to  claim 1 , wherein the rear end ( 24 ) of the nozzle stock insert ( 20 ) is spaced at a distance to the front end of an inner tube ( 18 ) of the torch neck ( 10 ) to form the rear inflow region formed by the rear gap ( 26 ). 
     
     
         4 . The torch neck ( 10 ) according to  claim 1 , wherein the rear gap ( 26 ) is located upstream—as seen in flow direction of the protective gas—of the gas outlet opening ( 8 ) of the nozzle stock ( 3 ) to form a linear gas flow. 
     
     
         5 . The torch neck ( 10 ) according to  claim 1 , wherein the front gap ( 25 ) is located downstream—as seen in flow direction—of the gas outlet opening ( 8 ) of the nozzle stock ( 3 ) to form a reverse flow of the stream of protective gas. 
     
     
         6 . The torch neck ( 10 ) according to  claim 1 , wherein the nozzle stock insert ( 20 ) has an outer surface ( 27 ) and the protective gas flows on the outer surface ( 27 ) of the nozzle stock insert ( 20 ) and/or in the interior of the nozzle stock insert ( 20 ). 
     
     
         7 . The torch neck ( 10 ) according to  claim 1 , wherein the nozzle stock insert ( 20 ) is connected to the nozzle stock ( 3 ), and is in particular pressed in. 
     
     
         8 . The torch neck ( 10 ) according to  claim 1 , wherein the flow space ( 11 ) is substantially at least one linear gap ( 12 ) between the inner wall ( 9 ) of the nozzle stock ( 3 ) and an outer wall ( 22 ) of the nozzle stock insert ( 20 ). 
     
     
         9 . The torch neck ( 10 ) according to  claim 8 , wherein the linear gap ( 12 ) is formed by grooves ( 13 ) substantially extending in length direction of the nozzle stock insert ( 20 ) on the outer wall ( 22 ) of the nozzle stock insert ( 20 ). 
     
     
         10 . The torch neck ( 10 ) according to  claim 1 , wherein the flow space ( 11 ) is substantially formed by a helical gap ( 14 ) that is formed by a thread ( 15 ) that substantially extends in length direction on an outer wall ( 22 ) of the nozzle stock insert ( 20 ). 
     
     
         11 . The torch neck ( 10 ) according to  claim 1 , wherein the opposing first ( 23 ) and second ends ( 24 ) of the nozzle stock insert ( 20 ) extend along the axis of the nozzle stock insert ( 20 ) with a length between the ends ( 23 ,  24 ), and in that the diameter of the nozzle stock insert ( 20 ) varies along its length. 
     
     
         12 . The torch neck ( 10 ) according to  claim 1 , wherein the nozzle stock insert ( 20 ) on its front end ( 23 ) facing the gas outlet ( 2 ) of the gas nozzle ( 1 ) has a smaller cross-section compared to the rear end ( 24 ) of the nozzle stock insert ( 20 ) facing away from the gas outlet ( 2 ) in order to form an annular channel ( 16 ) of the flow space ( 11 ). 
     
     
         13 . The torch neck ( 10 ) according to  claim 12 , wherein the flow direction of the stream of protective gas in the annular channel ( 16 ) is changed at least once, such that the flow duration or the flow path of the stream of protective gas is lengthened within the gas nozzle ( 1 ). 
     
     
         14 . The torch neck ( 10 ) according to  claim 1 , wherein the nozzle stock insert ( 20 ) has an inner passageway ( 21 ) configured to receive and pass therethrough an electrode or a wire for generating an arc between the electrode or the wire and the workpiece. 
     
     
         15 . The torch neck ( 10 ) according to  claim 1 , wherein the gas flow flows from an inner tube ( 18 ) into the nozzle stock insert ( 20 ). 
     
     
         16 . The torch neck ( 10 ) according to  claim 1 , further comprising a flow contact nozzle ( 17 ) positioned in the internal cavity ( 7 ) of the nozzle stock ( 3 ) such that the flow contact nozzle ( 17 ) extends into the internal cavity ( 7 ) of the nozzle stock ( 3 ). 
     
     
         17 . The torch neck ( 10 ) according to  claim 1 , wherein the nozzle stock insert ( 20 ), the flow contact nozzle ( 17 ), and the nozzle stock ( 3 ) are constructed of a conductive material, and the nozzle stock insert ( 20 ) contacts the flow contact nozzle ( 17 ). 
     
     
         18 . A torch having a torch neck ( 10 ) according to  claim 1  and further comprising either an electrode, arranged in the torch neck ( 10 ), or a wire for producing an arc between the electrode or the wire and a workpiece. 
     
     
         19 . The torch according to  claim 18 , wherein the nozzle stock insert ( 20 ) is arranged axially in a cavity ( 7 ) of the nozzle stock ( 3 ) between the torch neck ( 10 ) and the flow contact nozzle ( 17 ). 
     
     
         20 . A welding apparatus having a torch according to  claim 19 .